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(No Model.)

J. L. W. OLSEN.

WATER LEVEL ALARM.

No. 861,968. Patented Apr. 26, 1887.

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UNITED STATES PATENT OFFICE,

JOHAN LUDVIG \VALDEMAR OLSEN, OF COPENHAGEN, DENMARK.

WATER-LEVEL ALARM.

SPECIFICATION forming part of Letters Patent No. 361,968, dated April26, 1887.

, Application filed December 27, 1886. Serial No. 222,679. (No model.)

To (0Z6 whom it may concern.-

Be it known that I, JoHAN LUDVIG WAL- DEMAR OLsEN, a subject of the Kingof Denmark, residing at Copenhagen, in the Kingdom of Denmark, haveinvented certain new and useful Improvements in Water-Level Alarms forSteam-Boilers; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters and figuresof reference marked thereon, which form a part of this specification,and in which Figure 1 is a view of the front of a steamboiler providedwith my improved waterlevel alarm; and Fig. 2 is a vertical sectionalview on line as m, Fig. 1.

Similar numerals of reference indicate corresponding parts in both thefigures.

My invention has relation to apparatus for giving an audible alarm onthe undue rising or lowering of the water-level in steam-boilers; and itconsists in the improved construction and combination of parts ofsuch analarm, in which an electric circuit is closed and an alarm sounded onthe rising or lowering of the water-level beyond certain limits, ashereinafter more fully described and claimed.

In the accompanying drawings, the numeral 1 indicates the boiler-front,to which is secured a box, 2, having inwardly doubled flanges 3, whichsecure a plate or block, 4, of glass, ebonite, or similar non-conductingmaterial.

A bar, 5, of metal,is secured upon the face of the non-conducting block,and the ends of this bar, which is secured in a vertical position, areformed with inwardly-beveled lugs 6, and the upper end of the bar isprovided with a stop-lug, 7, above the beveled lug.

A shaft, 8, is journaled with its end projecting through the front ofthe boiler,and the said outer end of theshaft is provided wit-h anindex-hand, 9, the end of which may engage the beveled contact-lugs, theedges of the end being beveled so as to fit against the beveled faces ofthe lugs and to slide over them. An arm, 10, projects from the shaftwithin the boiler, and has a float, 11, upon its end,

which float will be supported upon the surface of the water in theboiler and rise and fall with the same.

One wire, 12, of an electric circuit is secured to a binding-post, 13,upon the contact:

bar, and this circuit is provided with a battery, 14, electromagneticalarnrbells 15, and has its other end secured to the boiler in anysuitable manner.

It will now be seen that as .the water either rises or falls in theboiler the arm with the float will rise andfall and the index willcomein contact with the lower or upper beveled I contact-lug, closing thecircuit andsounding the alarm, and if the water-level in the boilersinks very low the index will be stopped from being tilted too far up bythe stop-lug at the upper end of the contact-bar.

By having the inner faces of the contactlugs beveled, and by having theedges of the end of the index-hand beveled, the said beveled edges mayslide over and scrape the beveled contact surfaces, cleaning any dirtwhich may have accumulated upon them off from the said faces, and thusinsuring a contact at all times.

Having thus described my invention, I claim and desire to secure byLetters Patent of the United States- 'In a water-leve1 alarm forsteam-boilers,the combination of a box upon the boiler-front havinginwardly -doubled flanges holding a non-conducting block, a contact-barsecured vertically upon the non-conducting block and havinginwardly-beveled contact-lugs at its ends and having a stop-lug at itsupper end,a shaft journaled in the boiler-front and having an index-handupon its outer end playing between the contactlugs and having an armwithin the boiler provided with a float, and an electric circuit havingsuitable battery and electromagnetic alarm-bells and connected to thecontact-bar and to the boiler at its ends. as and for the purposeshown-and set forth. I

In testimonywhereof I ailix my signature in presence of two witnesses.

JOHAN LUDVIG WALDEMAR OLSEN.

Witnesses:

H. MoRrENsEN, Vrceo G. EHERTT.

